bosch rd 532 combi boiler leaking from syphon pipe

[jackofnotrade]

I have a bosch 532 combi boiler labeled as BG.

Had a problem with the boiler cutting out and no flame detected, checked online and read about condensation trap, plumber mate came round and loosened off pipe to bottom of the syphon chamber i believe, which fixed the problem

however i am know getting a leak from the bottom of the pipe where it connects into a 90 degree bend. the nut on the bottom of the cup/chamber is a one piece with plastic pipe. If i glue the joint I might not be able to unscrew it in future.

Any ideas would be great, thanks

Can get some pictures if it helps

 

[nickso]

pic would help. The trap was updated, if you have the old one it's worth updating for not much money.